Discussion
Which particle size is removed least efficiently?
Answer: D
Particles in the accumulation mode are too large to diffuse rapidly to surfaces and too small to sediment or to be efficiently intercepted, so they persist for a week or more and travel intercontinentally. Ultrafine particles coagulate quickly and coarse particles settle out within hours. The resulting gap in the removal efficiency is why the accumulation mode dominates the aerosol mass at long range.
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